The Ideal Temperature for Houseplants
Most houseplants thrive in the same 65-75F range people find comfortable. Learn the temperature limits, the danger zones, and which plants break the rules.
Tropical houseplants evolved in climates with stable, mild temperatures, which is exactly why they do well in our living rooms. The sweet spot for the vast majority is 65-75F during the day with a slight drop at night — close to standard room temperature.
The trouble starts at the extremes: cold windowsills in winter, hot air from vents, and sudden swings near doors. This guide lays out the comfortable range, the temperatures that cause damage, and the handful of plants that prefer it cooler or warmer than the norm.
The comfortable range
Aim for daytime temperatures of 65-75F and nighttime temperatures no lower than 55-60F for most foliage plants. A modest 5-10F nighttime drop is natural and even helps some plants, like orchids and Christmas cactus, set buds and flower. What plants dislike is not a steady cool or warm reading but rapid, repeated swings.
Because this band overlaps with human comfort, you rarely need to do anything special. The exceptions are spots that diverge sharply from the room average: a glass windowpane in January, the airstream from a heating vent, or an entryway that gusts cold every time the door opens.
Cold danger zones
Below 50F, most tropicals slow dramatically and may drop leaves; below 40F many suffer cold injury — blackened, mushy, or translucent foliage that often appears a day or two after the chill. Sensitive plants like calatheas, anthuriums, and African violets can be damaged at temperatures that merely feel cool to us.
The most common cold injury happens on winter windowsills, where leaves touching freezing glass freeze even though the room is warm. Cold drafts from doors and single-pane windows do similar damage. Keep tender plants a few inches off cold glass and away from drafty entries.
Heat and the plants that break the rules
Sustained temperatures above 85-90F stress most houseplants, accelerating water loss and causing wilting, leaf curl, and scorch — especially in dry air or direct sun behind glass. Cacti and succulents handle heat better but still appreciate airflow and shade from baking afternoon sun.
A few plants prefer it cooler: Christmas cactus, cyclamen, and many ferns are happiest in the low-to-mid 60s. Warmth-lovers like crotons, anthuriums, and most alocasias want the upper end, 70-80F, and sulk below 60F. When in doubt, match the plant to your room rather than chasing precise numbers.
- Keep tropicals away from anything below 50F
- A small night-time temperature drop is normal and healthy
- Cold glass can freeze leaves even when the room feels warm
- Sudden swings stress plants more than a steady cool or warm reading
FAQ
What temperature is too cold for houseplants?
For most tropical houseplants, anything below 50F causes stress, and below 40F risks real cold injury — blackened, mushy, or translucent leaves. Sensitive species like calatheas and anthuriums can be hurt by temperatures that merely feel cool to us. Keep tender plants away from cold windows and drafty doors in winter.
Can houseplants get too hot?
Yes. Sustained temperatures above 85-90F stress most houseplants, causing wilting, curling, and scorch, particularly in dry air or behind sun-baked glass. Succulents and cacti tolerate heat better but still benefit from airflow and protection from intense afternoon sun. Good ventilation and shading help during heatwaves.
Do houseplants need a temperature drop at night?
A small one is beneficial. A natural 5-10F dip at night mimics their native conditions and actually triggers blooming in plants like orchids and Christmas cactus. What plants don't like is a large or sudden swing. Keeping nights above 55-60F while allowing that gentle drop is ideal for most.